Follow these step-by-step instructions to create your stuffed bell peppers with quinoa:

1. Prepare the Bell Peppers:
   • Preheat your oven to 375°F (190°C).
   • Cut the tops off the bell peppers and remove the seeds and membranes.
   • Place the peppers in a baking dish, cut side up.
2. Cook the Quinoa:
   • In a medium saucepan, combine 1 cup of quinoa with 2 cups of water or vegetable broth.
   • Bring to a boil, then reduce the heat to low and cover.
   • Let simmer for about 15 minutes, or until the quinoa is fluffy and the liquid is absorbed.
3. Prepare the Filling:
   • In a large skillet, heat olive oil over medium heat.
   • Add chopped onion and garlic, sautéing until the onion is translucent.
   • Stir in the diced tomatoes, black beans, corn, cooked quinoa, cumin, chili powder, salt, and pepper.
   • Cook for an additional 5 minutes, stirring occasionally.
   • Remove from heat and stir in lime juice and chopped cilantro.
4. Stuff the Peppers:
   • Spoon the quinoa mixture into each bell pepper, filling them generously.
   • If desired, top with shredded cheese.
5. Bake the Peppers:
   • Cover the baking dish with foil and bake in the preheated oven for 30 minutes.
   • Remove the foil and bake for an additional 10-15 minutes, or until the peppers are tender and the cheese is melted and bubbly.
6. Serve and Enjoy:
   • Remove from the oven and let cool slightly before serving.
   • Enjoy your healthy and colorful stuffed bell peppers!